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62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
/* Argp example #2 -- a pretty minimal program using argp
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Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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/* This program doesn't use any options or arguments, but uses
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argp to be compliant with the GNU standard command line
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format.
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In addition to making sure no arguments are given, and
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implementing a --help option, this example will have a
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--version option, and will put the given documentation string
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and bug address in the --help output, as per GNU standards.
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The variable ARGP contains the argument parser specification;
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adding fields to this structure is the way most parameters are
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passed to argp_parse (the first three fields are usually used,
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but not in this small program). There are also two global
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variables that argp knows about defined here,
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ARGP_PROGRAM_VERSION and ARGP_PROGRAM_BUG_ADDRESS (they are
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global variables because they will almost always be constant
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for a given program, even if it uses different argument
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parsers for various tasks). */
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#include <stdlib.h>
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#include <argp.h>
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const char *argp_program_version =
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"argp-ex2 1.0";
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const char *argp_program_bug_address =
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"<bug-gnu-utils@@gnu.org>";
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/* Program documentation. */
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static char doc[] =
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"Argp example #2 -- a pretty minimal program using argp";
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/* Our argument parser. The @code{options}, @code{parser}, and
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@code{args_doc} fields are zero because we have neither options or
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arguments; @code{doc} and @code{argp_program_bug_address} will be
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used in the output for @samp{--help}, and the @samp{--version}
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option will print out @code{argp_program_version}. */
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static struct argp argp = { 0, 0, 0, doc };
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int
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main (int argc, char **argv)
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{
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argp_parse (&argp, argc, argv, 0, 0, 0);
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exit (0);
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}
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